A man who fled after allegedly pointing a gun at a Portland State University security officer Monday morning has been identified as David W. Chilton.

Portland Police and Portland State University have issued an alert urging the public to be on the lookout for Chilton, 54. He has gray hair and a gray beard, blue eyes, and was last seen wearing a dark jacket, rust colored plaid shirt over a green T-shirt, black shoes, and gray baseball cap. He had a North Face backpack, and a gym bag.

A campus security officer came upon Chilton and another man "loitering" outside Portland State University's Center for Science Education Monday morning, said Scott Gallagher, a spokesman for PSU.

After talking with the men, the officer learned there was a warrant for the arrest of one of them, Gallagher said.

After his companion was put in handcuffs, Chilton allegedly displayed a gun and pointed it at the officer, Gallagher said.

Chilton then "asked him if he wanted to die," according to information that officers relayed to investigators at the incident, which occurred around 10:20 a.m. Chilton then fled toward a parking garage at Southwest 12th Avenue and Market Street.

Portland Police, including tactical officers with the Special Emergency Reaction Team, swarmed the parking garage. Nearby buildings, including the Helen Gordon Child Development Center and Lincoln High School, were put in lockdown.

Traffic was diverted from Southwest Clay Street and 11th and 12th avenues during the incident and the Portland Streetcar was out of service for a time.

After calling out to Chilton, officers searched the parking garage, concluding around 1:50 p.m. that he was not in the structure.